/*
 * This file is part of WebGoat, an Open Web Application Security Project utility. For details, please see http://www.owasp.org/
 *
 * Copyright (c) 2002 - 2019 Bruce Mayhew
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the
 * GNU General Public License as published by the Free Software Foundation; either version 2 of the
 * License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without
 * even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
 * General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along with this program; if
 * not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
 * 02111-1307, USA.
 *
 * Getting Source ==============
 *
 * Source for this application is maintained at https://github.com/WebGoat/WebGoat, a repository for free software projects.
 */

package org.owasp.webgoat.lessons.ssrf;

import org.owasp.webgoat.container.assignments.AssignmentEndpoint;
import org.owasp.webgoat.container.assignments.AssignmentHints;
import org.owasp.webgoat.container.assignments.AttackResult;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.ResponseBody;
import org.springframework.web.bind.annotation.RestController;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.nio.charset.StandardCharsets;


@RestController
@AssignmentHints({"ssrf.hint3"})
public class SSRFTask2 extends AssignmentEndpoint {

    @PostMapping("/SSRF/task2")
    @ResponseBody
    public AttackResult completed(@RequestParam String url) {
        return furBall(url);
    }

    protected AttackResult furBall(String url) {
        if (url.matches("http://ifconfig.pro")) {
            String html;
            try (InputStream in = new URL(url).openStream()) {
                html = new String(in.readAllBytes(), StandardCharsets.UTF_8)
                        .replaceAll("\n","<br>"); // Otherwise the \n gets escaped in the response
            } catch (MalformedURLException e) {
                return getFailedResult(e.getMessage());
            } catch (IOException e) {
                //in case the external site is down, the test and lesson should still be ok
                html = "<html><body>Although the http://ifconfig.pro site is down, you still managed to solve" +
                        " this exercise the right way!</body></html>";
            }
            return success(this)
                    .feedback("ssrf.success")
                    .output(html)
                    .build();
        }
        var html = "<img class=\"image\" alt=\"image post\" src=\"images/cat.jpg\">";
        return getFailedResult(html);
    }

    private AttackResult getFailedResult(String errorMsg) {
        return failed(this)
                .feedback("ssrf.failure")
                .output(errorMsg)
                .build();
    }
}
